| A block of Changqing Oilfield is located in Dingbian County,Shaanxi Province and it’s sedim entary background is inland lake basin delta deposits whose deposition mass is a gray,dark gray mudstone,argillaceous siltstone with gray green,gray white,fine sandstone interbedded.The main developposition are Chang 4+52 and Chnag 61 sand groups.The average porosity of 4+52is 11.54%and the permeability is 1.125mD,the average porosity of 61 is 12.49%,and the permeability is 1.1 mD.At present,there are 445 oil production wells,which product oil 409t everyday,and the integrated water cut of it is 29.4%.There are 173 water injection wells and the amount of daily water injection is 3624 m~3.Affected by the factors such as incomplete injection production,unreasonable technical policies and other factors,the A district showed low efficiency and low yield.Firstly,this paper studies the geological features of the A region,make the basic features of reservoirs clear.Secondly,the paper studies the injection of A,application of water breakthrough direction recognition technology in A wells water,effective characteristics analysis,make clear the distribution of the remaining oil.Then this formula method,reasonable oil recovery rate method determine a reasonable well spacing density,from water flooding control degree,water flooding reserves producing degree,sand body connectivity of start of a injection and the corresponding conditions were studied,and analysis of "have no","has taken no note" of the influencing factors.Finally the paper uses reservoir engineering method to determine reasonable water injection rate,reasonable injection production ratio and reasonable pressure system development technology and policy,through improving the injection production well pattern,flat,fine profile note mining regulation measures to adjust a note production corresponding,and ultimately to improve waterflooding effect and improve the recovery ratio. |
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